Chimney cowl and ventilator.



.No. 805,344. PATENTED NOV. 21, 1905. 1). COLLINS.

CHIMNEY GOWL AND VENTILATOR.

APPLICATION IILED SEPT. 24, 1904.

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UNITED STATES PATENT OFFICE.

CHIMNEY COWL AND VENTILATOR.

Specification of Letters Patent.

Patented Nov. 21, 1905.

Application filed September 24, 1904. Serial No. 225,816.

To all whom it may concern:

Be it known that I, DANIEL COLLINS, a citizen of the United States, residing at Mount Vernon, in the county of Westchester and State of New York, have invented new and useful Improvements in Chimney Oowls and Ventilators, of which the following is a specification.

This invention relates to an improved chimney cowl and ventilator, and has for its objects to produce a comparatively simple inexpensive device of this character through which in practice there will be a strong current of air drawn from the external atmosphere, thereby insuring a steady upward draft through the cowl from the flue and obviating downward or back drafts in the latter.

Afurther object of the invention is to provide means whereby the external air will be caught and directed into the cowl for producing the upward draft therethrough.

To these ends the invention comprises the novel features of construction and combination of parts more fully hereinafter described.

In the accompanying drawings, Figure 1 is a vertical section centrally through a cowl embodying the invention. Fig. 2 is a horizontal section thereof, taken on the line 2 2 of Fig. 1.

Referring to the drawings, 1 designates the body of the cowl, composed of sheet metal or other appropriate material and preferably of tubular form, having at its ends conical reducing portions 2, from which project upper and lower reduced tubular necks 3 and 1, of which the latter seats into the end of the flue or chimney, while over the former there is seated a conical cap 5, having a depending vertical flange 6, which incloses the neck 3,

the cap being retained in place by members or brackets 7.

Within the main body-tube 1 there is centrally disposed a secondaryinner tube 8, preferably of truncated conical form and arranged with its reduced end uppermost, there being seated in the lower end of the inner tube 8 a tubular member in the form of a ring or annulus 9, having entered therein at diametrically opposite points the inner ends of four inclosed draft openings or ducts 10, having enlarged entrance mouths and inwardly convergent walls, there being arranged between the ducts 10 air passages or conduits 11, leading upward through the body 1 between the lateral air inlets 10, whereby the air and products of combustion from the chimney or flue may pass freely upward through the cowl, it being understood that these passages 11 are not in communication with the external atmosphere and that the inlets 10 are likewise free from communication with the main body of the cowl except through the inner conical tube 8.

Arranged within the tubular body 1 immediately above the tube 8 isa truncated conical shield or deflector 12, which directs the air arising from the flue or chimney into the path of the current of air passing upward in the cowl through the tube 8, while within the ring 9 there is disposed blades or partitions 13, extending at right angles diametrically across the ring between the ducts or inlets 10 to prevent the air entering one duct passing outward through another. There is arranged beneathand closing the lower end of the ring 9 an inverted conical deflector 14, disposed with its apex downward and designed not only tov prevent passage of air from the chimney upward through the ring, but to also direct such air outward through the vertical passages 11, while upon the outer face of the body 1 and directly beneath the mouths of the ducts 10 there are attached horizontal deflecting members or wings 15, which extend, respectively, beneath their adjacent inlets 10 and have downwardly and inwardly inclined bottoms, whereby a current of air striking downwardly thereon will be deflected and di rected into the inlets 10, these trough-shaped deflectors being each provided with a drainopening 16 for the escape of any water which they may receive.

In practice the draft of air arising from the flue or chimney will pass upward through the cow], while external currents of air will enter the latter through the inlets 10 and conical tube 8. The air in passing through the tube 8 will, of course, leave the upper smaller end of the latter in a condensed and strong volume and thence upward through the remaining portion of the cowl, thereby inducing a strongupward draft through the latter, while the shield or deflector 12 will direct the air from the chimney into the path of the central force draft or current, whereby the air will all be carried upward together and outward through the exits 17, between the reduced neck 3 and cap-flange 6. Thus it will be seen that in my improved device there is a strong central current of air which serves to induce an upward draft through the cowl and draw the air and products of combustion from the chimney and prevent downward currents or back draft in the latter.

It is apparent from the foregoing that I produce a simple efiioient device which in practice will admirably perform its functions, it being understood that minor changes in the details herein set forth may be resorted to without departing from the spirit of the invention. For instance, the trough -shaped deflectors 15 are designed, primarily, for use when the chimney to which the device is applied is located at apoint surrounded by high walls or buildings by which the wind will be directed downward and that when such conditions do not obtain these external deflectors may be dispensed with.

Having thus fully described the invention, what is claimed as new is 1. A device of the class described comprising a tubular body having longitudinal air passages, a reduced tubular member arranged within the body and having an upper c0n tracted discharge-throat, and inclosed lateral ducts leading into the body and entering through the wall of the tubular member, the air-passages being disposed between and distinct from the ducts.

2. A device of the class described comprising a tubular body, a tubular member of reduced diameter arranged within the body, a

shield having downwardly-convergent wallsarranged beneath and closing the lower end of the tubular member, an inner tube arranged above the member and having a reduced discharge-mouth, inclosed lateral airducts leading into the tubular body and entering through the Wall of the tubular member, division-plates arranged within the member for closing communication between the ducts, the body being provided with longitudinal air-passages leading between and distinct from the ducts, and a reduced deflector disposed above the inner tube.

3. A device of the class described comprising a tubular body having longitudinal airpassages, a tubular member of reduced diameter arranged within the body, inclosed lateral ducts leading into the body and entering through the wall of the tubular member, a deflector arranged beneath and closing the lower end of the tubular member, said deflector having downwardly-convergent walls, and an inner upwardly-convergent tube arranged above the tubular member and having a reduced discharge-throat.

In testimony whereof I affix my signature in presence of two witnesses.

DANIEL COLLINS. 

